Using FTIR

the relations between the concentration of the gauche conformations and its distribution in the UHMPE gel-films prepared from different conditions and their superdrawabilities have been studied. It has been found that the gauche conformations and the chain entanglements are closely related and the conformation ratios (σ=I1303/I1352) increases with the concentration at which the gel-films were prepared. There exist critical concentrations (0.4- 0.5g/100ml) corresponding to the proper chain entanglements as obtained from ηsp on which maximum draw ratio can be reached (λmax).Annealing also has great influence on σ

but temperature is more important than time. Superdrawability could be attained in the annealing temperature range when σ has the lowest value.